<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>可能遇到的问题总结演示</title>
		<style type="text/css">
			div{
				border: 1px red solid;
				width: 800px;
				height: 500px;
				margin: 0 auto;
				display: flex;
				flex-flow: wrap row;
				flex-wrap: wrap;
				writing-mode: vertical-lr;

			}
			div>span{
				background: lightblue;
				width: 100px;
				height: 100px;
				border: 1px black solid;
			}

		</style>
	</head>
	<body>
		<div>
			     
			<span>1</span>
			<span class="spe">2</span>
			<span>3</span>
			<span>4</span>
			<span>5</span>
			<span>6</span>
			<span>7</span>
			<span>8</span>
			<span>9</span>

			
		</div>
	</body>
</html>
